REPORT OF THE SECRETARY GENERAI,. 225 



Petroleum and asphalt in the United States, by Eugene Wesley Shaw. 



Recent progress in electrical smoke precipitation, by F. G. Cottrell. 



Recientes adelantos en la prdctica metaliirgica en el Peru, by Michel Fort. 



The electric furnace in metallurgy, by Joseph W. Richards. 



The field for cyaniding in South America, by Herbert A. Megraw. 



The hydrofnetallurgical treatment of complex gold and silver ores, by G. Howell 



Clevenger. 

 The occurrence and preparation of radium and associated metals, by 



Charles L. Parsons. 

 The prospect for marketing South American zinc ore, by W. R. Ingalls.. 

 The storage and handling of explosives in mines, by Charles E. Munroe. 



SUBSECTION 3. 



ECONOMIC GEOLOGY. 



Area de distribucion de los yacimientos petroliferos y estado actual de su 



explotacion en la Argentina, by Enrique M. Hermitte. 

 Coal fields of the United States, considered as sources of supply for the 



Western Hemisphere, by M. R. Campbell. 

 Contrihucion al estudio de la figura de la Tierra; sobre el notable paralelismo 



de los sistemas de montanas del Globo, by I^uis Matamoros Sandoval. 

 Edad de los fosiles peru^nos, by Carlos I. I^isson. 

 Geologia general de la Republica de El Salvador en lo que se relaciona con 



la Mineria, by Luis Fleury. 

 Geologia general y economica de Colombia, by Tulio Ospina. 

 Gold and silver deposits in North and South America, by Waldemar 



I^indgren. 

 Los yacimientos de los mdnerales de wolfram en la Republica Argentina ^ by 



Roberto Beder. 

 Organization and. costs of geological surveys, by David White. 

 Outline of the petroleum resources of Ecuador, by Cesar D. Andrade. 

 Resena geologica del Departamento de Cundinamarca — Cordillera Oriental 



de los Andes colombianos, by Ricardo Lleras Codazzi. 

 The coals of Brazil, by I. C. White. 

 The petroleum resources of Mexico, by D. T. Day. 



The phosphate resources of the United States, by George Rogers Mansfield. 

 The public's interest in mineral resources, by George Otis Smith. 



